Edwaed weston



3 Sheets-Sheet 1.'

(No Model.)

B. WESTON.

ELECTRIC ARG LAMP.

Patented Sepj z. 25, 1883.

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(No Model.) 3 Sheets-Sheet-2.

E. WESTON.

ELECTRIC ARC LAMP.

Patented Sept. 25, 1883.

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(No Model.) 3 Sheets-Sheet 3'.

E. WESTON.

ELEGTRIG ARG LAMP.

No. 2a5,715.- Patented Sept. 25, 1883.

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Inventor.

N. PETERS. PMlo-Lkhognpbnr. wanna". 0.1:.

UNITED STATES PATENT OFFICE.

EDX'U RD XVESTON, OF NE\VARK, NEV JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEIV YORK, N. Y.

' ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 285,715, dated September 25, 1883.

Application filed AprilG, is ss. (No model.)

To aZZ whom it may concern.-

Be it known that I, EDWARD WEsroN, a subject of the Queen of Great Britain, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Electric-Arc Lamps, of which the following is a specification.

In describing the nature and objects of my invention reference will be made to the accompanying drawings, in which- Figure l is a front View, in elevation, of the feed mechanism and upper portions of the frame of a lamp constructed in accordance with my invention. Fig. 2 is a side View, in elevation, of the feed mechanism, portions of the casing being cut away. Fig. 3 is a plan and part section on line :0 m of Fig. 2. Fig. 4 is an illustration of the armature and clutch mechanism; Fig. 5, a plan view of the same.

Similar letters of reference indicate corre sponding parts in all the figures.

The main objects of my invention are to simplify and cheapen the construction of the working parts of the lamp, to provide for a greater range, and consequently greater simplicity of adjustment, and to produce a lamp which, by reason, mainly, of a construction which relieves the moving parts of strain and wear, shall I possess greater durability than those now in common use.

To this end I have devised a feed mechanism in which are combined two electro-mag nctsone in the direct or are circuit, the other in a shunt or derived circuit around the arc .and two armatures, one for each magnet, the armatures being rigidly connected to a rock shaft, and soplaced that the preponderance of magnetic attraction of one magnet over the other exerts a twisting effect upon the rockshai't that turns it in its bearings, the direction olthe movement imparted to it being determined by that magnet which exerts the greater attractive power. I have also constructed and arranged the parts named in such manner that the maximum magnetic effect of which the magnets are capable is utilized, and in certain other respects the construction of the mechanism is improved, the nature of the improvements being more fullyhereinafter set forth.

For the casing or frame I employ by preference that shown and described in former patents granted to me and in applications by me made, and the feed mechanism I mount on a plate or base, A, which is attached in a proper manner to the under side of the insulated cover or top A.

On opposite sides of the plate A are secured the electro-magnets B 0, each composed of a core of soft iron, b, the ends of which pass through the non-magnetic plates 0 c, that are secured to the plate A. The cores 2) contain each two coils, D E, the coils D being of comparatively coarse wire and included in the main or are circuit, the coils E being composed of fine wire of high resistance and included in a shunt around the arc. The coils are separated bya metal ring, F, the direction of winding being such as to make the ends of the cores of opposite magnetic polarity. Pole-pieces or plates of iron, G G, are fastened to the ends of the cores 1) by screws 11, that serve also to bind the cores to the plates 0 0. Holes are bored through the rings F and the center of the cores 1), and screws II H inserted therein, 7 5 which serve to hold the rings F in place upon the cores Z), and provide pivotal bearings for a rock-shaft, K, that extends into the holes through the rings and cores.

Upon shaft K are fixed two armatures or magnetic plates, L M, out of line or at an an gle to each other, so that when one occupies a horizontal position between the pole-pieces of its magnet the other will. be tilted, so that the pole-pieces between which it swings will be one above and one below its ends, substantially as shown in Fig. 4.

To the armature L, or that which lies between the poles of the main magnet B, is connected the clutch or feeding mechanism. c This may be of any suitable character, though I prefer to use a cylinder of brass or other metal, f, surrounding the carbon carrier It, which passes vertically through guides in the top of the casing and in the lower portion of 5 a frame, N, that depends from the plate A. The carrier also passes through the rocleshaft K, the latter being divided at k for the purpose.

Ears or lugs g extend from the side of cyl- 10o inder f, and between them is pivoted a lever,

m, which is open or formed with two arms,

that inclose the cylinder f. The short arm of lever m is connected by one or more links, n, 5 with the armature L.

To either armature, or in a similar manner connected with the rock-shaft, is the piston p of a dash-pot, P, pivoted at its bottom to the frame N. From one of the pole-pieces or the plate A depends also an adjustable arm, S, that at its lower end is bent over to form a step or rest, 8, forthe end of lever m.

When thus constructed, the lamp operates in the following manner: Normally,the arma- I 5 tures occupy the position shown in Fig. 4.

. The weight of the carbon carrier, or the influence of a spring, which is not shown,

may be employed and connected'with one of the moving parts in such manner as to assist the armature M in assuming a horizontal po-' sition. When, therefore, the circuit is completed through the lamp, the greater attractive j power of magnet B tends to bring armature L into a horizontal position. An increase of resistance in the main circuit, as by the length ening of the arc, diverts a greater amount of current through the shunt-magnet C, so that it gains in strength, while the other loses. Armature M, in consequence, isbrought nearer the horizontal, while armature L is tilted. The requisite movement is thus obtained for efi'ecting the feed and adjustment of the carbons. When the armature L, by the attraction of magnet B, is brought toward a horizontal position, the short arm of lever m is raised, by this means binding the lever against the cylinder f, and causing it in turn to bind the carbon-carrier R, which, by the fur ther movement of the armature, is raised and the arc formed. On the backward movement 0 4 of armature L the end of lever m is brought into contact with the step or rest, by which the cylinder f is freed and the carrier Rpermitted to slide downward until its motion is again arrested by the raising of the armature L. These movements, which constitute the operation of feeding, are in the practical operation of the lamp so minute, of course, as to be scarcely perceptible.

Having now described the most practicable embodiment of my invention and the principle of the operation of the same, I will indicate more specifically the features-of construction that contribute most to the utility of the 5 5 lamp, and also the more obvious waysin which the construction of the several parts may be modified without departing from the invenj with regulating-magnets in the main and shunt circuits, respectively, of pole-pieces at right angles to the cores, armatures arranged to i move or rotate between the pole-pieces in the manner described, and feed mechanism contion.

-With reference to the magnetic system, it will be seen that by pivoting an armature between the poles of the same magnet in such manner that the attractive forces acting upon it tend only to change the position of said armature in the same plane, the bearings of the 6 5 shaft on which the armature is mounted will .-be protected from wear. This part of the in;

- tures fixed to the shaft at different angles, and

ranged to move in face of the poles of the mag- 1 nets, and feed mechanism connectedwith the armatures, as set forth.

vention is applicable to lamps containing a single magnet, as B, with any of the well-known substitutes for magnet O, to act in opposition to the attraction of the magnet.

Another novel feature in the magnet system is the employment of two armatures, which, by extending from pole to pole of each magnet and nearly completing themagnetic circuits, secure the maximum power of the magnets without adding to the load which the latter sustain.

A lamp of this kind, when properly c011- structed, requires little or no adjustment. Should it be necessary, however, to vary the attractive influence of the magnets on the armatures, any of the well-known means of adj ustment may be employed, such as a retractile spring connected with either armature, or a device for separating to a greater or less degree the armature and magnet-poles.

The several parts of the lamp feeding mechanisms are all carried by the plate A, so that they may be removed bodily from the casing whenever it is necessary. They are also constructed in a simple manner, and so as to require comparatively little time or expense in their production or assemblage.

I reserve the right to make subject of other applications for Letters Patent features of novelty herein shown or described, but not claimed.-

What I now claim as my invention is- 1. In an electric-arc lamp, the combination of two electro-magnetsone in the main, the other in a shunt, circuita rock-shaft set at right angles to the magnets, and armatures fixed to the rock-shaft, and arranged to move in face of the poles of the magnets, in substantially the manner set forth.

2. In an electric-arc lamp, the combination of two electro-magnetsone in the main, the other in a shunt, circuita rock-shaft set at right angles to the magnets, and two arma- I I0 arranged to move in parallel planes in face of the poles of the magnets, in substantially the manner set forth. 7

3. I11 an electric-arc lamp, the combination,

with aplate, of two electro-niagnets in the main and shunt circuits, respectively, and secured to the plate, a rock-shaft pivoted in the center of cores of the magnets, two armatures fixed to the shaft at different angles; and ar- 4. The combination, in an electric-arc lamp,

nected with said armatures, as set forth.

5. The combination, with the plate A, of 13o cores b b and coils D E, secured to plate A,

rock-shaft K, journaled in said core, armatures L M, and feed mechanisms connected there- In testimony whereof I have hereunto set with, as described. my hand this 2d day of April, 1883.

6. The combination, with the plate A, of feed mechanism secured thereto, an arm or EDXVARD VESTON. 5 frame, N, depending from the plate and f0rming a guide for the carbo11-carrier, and a dash- XVitnesses: pot, P, hinged to the frame, as and for the XV. FRISBY, purpose set forth. RAYMOND F. BARNES. 

